/Engine/Source/Runtime/Engine/Classes/Engine/Level.h
Get a properly formated external actor package instance name for this level package to be used inFLinkerInstancingContextexternal actor package instance name
static [FString](API\Runtime\Core\Containers\FString) GetExternalActorPackageInstanceName ( const [FString](API\Runtime\Core\Containers\FString) & LevelPackageName, const [FString](API\Runtime\Core\Containers\FString) & ActorPackageName )